Rectification current in insulators obeys a zero-temperature sum rule expressed as a ground-state cumulant minus a many-body multi-state geometric tensor, generalizing known single-particle results.
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Multi-State Geometry of Density Matrices and Rectification Sum Rules
Rectification current in insulators obeys a zero-temperature sum rule expressed as a ground-state cumulant minus a many-body multi-state geometric tensor, generalizing known single-particle results.